A cool Valentines mini boss would be a pig called Cupig with the NoGravity tag so it flies, but is changed so it can go up and down, but summons skeletons to shoot you (Mini Cupids).
Guys, if you have an idea for a new mini boss then it's better to use this form: https://empireminecraft.com/threads/mob-suggestions-form.58973/ This will make sure that the staff gets to see it and then they can work things out. Also, but this is simply my opinion, I think this post would be better off in the "Community discussions" forum because it's not really a suggestion you're making. But.. that's just my 2 cents
Well: I'll be honest, now: I'm feel quite cool being able to quote the first post in a locked thread I know it's not such a hard thing to do, but you got to do some tricks for it